<ng-template #popoverTpl>
  <div [innerHtml]="html"></div>
  <ng-content></ng-content>
</ng-template>
<i class="fa fa-question-circle"
   aria-hidden="true"
   [popover]="popoverTpl"
   placement="bottom"
   container="body"
   [outsideClick]="true">
</i>
